Device for deflecting a stream of elastic fluid projected into an elastic fluid



Sept. 1, 936. coAN 2,052,869

' H. DA DEVICE FOR DEFLECTING A STREAM OF EL IC FLUID PR CTED INT N ELASTIC-FLU ed April 1935 INVEN'TOR HENRI-UGANDA flamwofi AITTORNEYS Patented Sept. 1," 1936 UNITED 'STATES PATENT OFFICE ELASTIC FLUID Henri Coanda, Clichy, France Application April 19, 1935, Serial No. 17,361 In France October 8, 1934 team. (or. 299-101) It is an observed i'act that when astream or sheet oi fluid issues through a suitable oriflce, into another fluid, it will carry along with it a portion of the surrounding fluid, it its velocityis mflicient. In particular, if a sheet of gas at high velocity issues into an atmosphere of another gas of any kind, this will produce, at the point of discharge of the said sheet of gas, a suction efl'ect, thus drawing forward the adjacent gas.

Ii, at the outlet of the 'fluidstream or sheet, there is set up an unbalancing effect on the flow oi the surrounding fluid induced by said stream, the latter will move towards the side on which the flow oi the surrounding fluid has been made more dimcult.

It is thus evident that it will be possible, by a suitable checking of the surrounding fluid on one side of the oriflce from which the fluid stream or sheet is discharged at high velocity, to act in- 0 effect in the flow of the surrounding fluid induced by a sheet or stream of fluid which is dis- ,charged thereinto at high velocity.

For this purpose, the discharge orifices for the fluid each include, on the side toward which the said sheet or stream is to be deflected, guiding means, for instance a flap which is suitably inclined according to the rate of flow and the velocity of the fluid, and said flap may be more or less extended and may be more or less inclined, according to the path which the said stream is to be made to follow. On the other hand, by a proper knowledge 01 the physical constants of the surrounding fluid and of the fluid discharged the direct reactions due to the abrupt discharge of one fluid intoanother; which reactions are 55 even greatly increased by the fact that on the are discharged at high speed into another fluid 5 through a nozzle, in the. case of an equilibrium or a lack of equilibrium of the facilities oi withdrawal of the surrounding fluid at the sides of the stream.

Fig. 1 shows the free discharge of a fluid l0 stream l, issuing from a nozzle, for instance, whose cross section has the form of ,a slbt 2, also showing the induced flow oi the surrounding fluid according to the arrows 3.

Fig. 2 shows the checking of the surrounding it fluid on one side of the stream by means, of a flap 4 which prevents the flow oi the surrounding air from space 5, and also the deflection, according to the arrows t, of the issuing stream discharged from the said nozzle.

Fig. 3 represents the flap d which is extended according to a given outline, thus producing a strong suction, at 6, of a stream which is entirely turned about, according to the arrows i. This will eliminate the impact upon the surrounding fluid, which occurs in front of a sheet oi fluid discharged at high velocity into another fluid.

I 'claim 1. A device for controllingthe discharge into I an elastic fluid atmosphere oian elastic fluid moving at a high velocity, which compriseaa part provided with an outlet conduit, and means carried by said part," located wholly on only one side of the line of discharge of said conduit, for checking the flow of the elastic fluid of said atissuing from said conduit.

2. A device for controlling the discharge into an elastic fluid atmosphere of an elastic fluid moving with a high velocity, which comprises, a part provided with an outlet conduit, and an element carried by said part projecting beyond the outlet of said conduit, located wholly on only one side of the line of discharge of said conduit,

for checking, on this side, the flow oi. the elastic fluid of said atmosphere induced by the stream of elastic fluid issuing from said conduit. 7 3. A device according to claim 2 in which the outline of the projecting element is curved outwardly from the line of discharge oi the conduit until it runs in 'a direction opposite to the direc--v tionoi flow of the elastic fluid through said conduit, in order to cause thestream of said elastic fluid issuing from said conduit to flow along said outline and reverse its direction.

mosphere induced by the stream of elastic fluid 4. A structure tor the discharge of an eiaatic fluid under pressure into the atmosphere which includes a part having a chamber formed therein for containing said elastic fluid under pressure. said part being provided with a slot-shaped passage connecting said chamber with the atmosphere, and a projection on the outer surface I said part extending along one edge of said sl t and located wholly on one side or the line oi! di charge of said slot.

5. A structure for the discharge of an elastic fluid under pressure into the atmosphere which includes a part having a chamber formed therein for containing said elastic fluid under pressure, said part being provided with a slot-shaped passage connecting said chamber with the atmosphere, and a projection on the outer surface or said part running along one edge of said slot and located wholly on one side oi! the line of discharge of said slot, said projection being tangential to said edge of the slot and being curved outwardly from said line of discharge until it runs in a direction opposite to the direction of flow of said elastic fluid through said passage,

in order to cause the stream of elastic fluid issuing from said passage to flow along said rounded or curved projection and reverse its direction. HENRI COANDA. 

